Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ad5b561e0aafd6…

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 04:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 75ee4472d2699fd62908ce1fac211304 SHA-1: f95ad950a5e2e27ae32aee1c210b06f2d60a8c7f SHA-256: 50ad5b561e0aafd6150547ae74c807f4e432a49bf1c3714e62a4acd5c02e24a6
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, suggesting it is designed to redirect users to malicious content or download further payloads. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=1080p+dual+audio+movie+download PDF link annotation
    • http://joltiy.ru/uploads/files/sumemosap.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/detifup.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/lilaz.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecd0e73bb0---xolivadumimo.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/kapixuzidulasupuwewiraf.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/jawinodazeza.pdfIn PDF document text
    • http://fourfoods.com/images/files/99801215313.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/53195732266.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/pogaxizufikukibob.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210919023309.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/guguzu.pdfIn PDF document text
    • http://njchemland.com/upload/files/34667518924.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/24407841740.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/xazeresomilukogojijaje.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/45288821694.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210911_386C6E11D01E8146.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/xapegejiriwerogo.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/43538711041.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210909055801.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/22922497505.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/5q90gpqiiik0kahmrnb7lvgmsr/75687276999.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144fabe23681---92322176008.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/r88gaqqk8u0oacjkqqdk2e239v/tojuboropejonalogoja.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/vefenimifonuruzav.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/83848760994.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38A 10724 bytes
SHA-256: 06f52e0d40757482c3ff6d317776fb4eb90eec376579a1bb102e6457fd623078
font_02_sfnt_off00010c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C27 17216 bytes
SHA-256: 13d7278f62f63f84d5a81bf8aab80264822c9a6a6cfbcfcad8cdb1ed2e3dc3c2

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